2025 Tax Return Documents Checklist for Extended Filers
If you extended your 2025 federal return, the filing deadline is getting close. Before you send a stack of files to your preparer, make sure it tells the whole story. Missing income, payment records, or business expenses can delay an accurate return.
Here is a practical checklist. Not every item applies to everyone. Gather what fits your situation, and flag anything you cannot locate.
Start with your basic filing information
Have Social Security numbers or ITINs for everyone on the return, your current address, last year's return, any Identity Protection PIN issued by the IRS, and bank information if you want direct deposit or plan to pay electronically. If you changed your name, make sure your tax information matches your Social Security record.
Collect every source of 2025 income
Check for W-2s from all employers and 1099s from banks, brokers, clients, payment platforms, retirement accounts, unemployment, and other payers. Include side jobs and digital-asset activity even if no form arrived. If you received Marketplace health insurance, include Form 1095-A. Compare the forms against your own records so a missing statement does not turn into missing income.
Pull together deduction and credit support
Depending on your return, that may include mortgage interest and property tax statements, charitable contribution records, childcare costs and the provider's information, education records, HSA contributions, and retirement contributions. For 2025, some new deductions require separate records such as tip logs or pay statements showing qualified overtime. Do not assume a deduction applies just because you have a receipt; eligibility depends on the rules and your facts.
If you had business or rental income, bring the records behind the numbers
For self-employment, gather bank and payment-processor statements, invoices, expense receipts, mileage logs, office expense records, and estimated-tax payments. If you paid a business expense with a personal card, do not leave it out automatically; document what the expense was for and how it was recorded. For rental property, bring rent records, mortgage interest, property taxes, insurance, repairs, improvements, purchase or sale paperwork, and any existing depreciation schedule. Separating repairs from improvements matters, so do not label everything the same way.
Keep proof of your extension and tax payments
Find your extension confirmation and records of federal estimated payments, withholding, and any payment made with the extension. A filing extension generally gives an individual taxpayer until October 15 to file; it does not extend the original deadline to pay. Some taxpayers have different dates because of disaster relief or other circumstances, so check the deadline that actually applies to you.
Missing a W-2, 1099, or another key document?
Start by contacting the employer or payer for a replacement or correction. If you still cannot get it, tell your preparer what is missing and provide your own records. Do not quietly guess at a number or omit the income. The right next step depends on the form and the information available.
Your next step
Put the documents in one secure place. Make a short list of missing items and questions. Then review the return for completeness before it is filed. If you need help getting organized or deciding what applies, use Finance With Nyeem's Start Here form: https://financewithnyeem.com/start
For more on the deadline itself, read our guide: https://financewithnyeem.com/blog/october-15-tax-deadline-2026
If a personal card paid for a business expense, see: https://financewithnyeem.com/blog/business-expenses-paid-with-personal-card
IRS source: https://www.irs.gov/filing/gather-your-documents
Educational information only. Tax rules and outcomes depend on your facts and may change. This article is not individualized tax, legal, or financial advice.
